Transmission line, impedance transformer, integrated circuit mounted device, and communication device module

Abstract

A transmission line includes two tapered lines having a tapered planar shape and arranged in parallel, opposite lines provided in opposition to the narrower width sides of the two tapered lines, and a bonding wire for connecting the narrower width sides of the two tapered lines and the opposite lines, wherein the width between two outer edges on the narrower width sides of the two tapered lines arranged in parallel is greater than the width between outer edges on the opposite side of the opposite lines in opposition to the narrower width sides of the two tapered lines.

What is claimed is: 
     
       1. A transmission line comprising:
 two tapered lines having a tapered planar shape and arranged in parallel; 
 an opposite line provided in opposition to the narrower width sides of the two tapered lines; and 
 bonding wires for connecting the narrower width sides of the two tapered lines and the opposite line, wherein 
 the distance between two outer edges on the narrower width sides of the two tapered lines arranged in parallel is greater than the distance between outer edges on the opposite side of the opposite line in opposition to the narrower width sides of the two tapered lines. 
 
     
     
       2. The transmission line according to  claim 1 , wherein
 the opposite line includes one opposite line, and 
 the distance between two outer edges on the narrower width sides of the two tapered lines arranged in parallel is greater than the width on the opposite side of the one opposite line. 
 
     
     
       3. The transmission line according to  claim 1 , wherein
 the opposite line includes two opposite lines, and 
 the distance between outer edges on the narrower width sides of the two tapered lines arranged in parallel is greater than the distance between two outer edges on the opposite side of the two opposite lines. 
 
     
     
       4. The transmission line according to  claim 1 , wherein
 the opposite line has a rectangular planar shape. 
 
     
     
       5. The transmission line according to  claim 1 , wherein
 the opposite line has a tapered planar shape. 
 
     
     
       6. The transmission line according to  claim 1 , wherein
 the bonding wires comprise a first set and a second set, 
 a plurality of wires in the first set extends in a first direction in parallel with one another when projected on the plane of the opposite line, and 
 a plurality of wires in the second set extends in a second direction in parallel with one another, the second direction being different from the first direction when projected on the plane of the opposite line. 
 
     
     
       7. The transmission line according to  claim 1 , wherein
 the two tapered lines are formed on a high dielectric substrate, and 
 the opposite line is a low impedance line formed on a high dielectric substrate. 
 
     
     
       8. The transmission line according to  claim 1 , wherein
 the two tapered lines are formed on a low dielectric constant substrate, 
 the opposite line is a low impedance line formed on a high dielectric constant substrate. 
 
     
     
       9. The transmission line according to  claim 8 , further comprising a high impedance line formed on a low dielectric constant substrate, the dielectric constant of which is lower than that of the high dielectric constant substrate on which the opposite line is formed and to which the opposite line is to be connected, wherein
 the opposite line is connected to the high impedance line, and 
 the transmission line forms an impedance conversion circuit. 
 
     
     
       10. An integrated circuit mounted device, comprising;
 an integrated circuit; and 
 a transmission line, 
 the transmission line comprising:
 two tapered lines having a tapered planar shape and arranged in parallel; 
 an opposite line provided in opposition to the narrower width sides of the two tapered lines; and 
 bonding wires for connecting the narrower width sides of the two tapered lines and the opposite line, wherein 
 the distance between two outer edges on the narrower width sides of the two tapered lines arranged in parallel is greater than the distance between outer edges on the opposite side of the opposite line in opposition to the narrower width sides of the two tapered lines. 
 
 
     
     
       11. The integrated circuit mounted device according to  claim 10 , wherein
 the transmission line is provided on the output side of the integrated circuit, and 
 an output of the integrated circuit and the wider width sides of the two tapered lines of the transmission line are connected by bonding wires. 
 
     
     
       12. The integrated circuit mounted device according to  claim 10 , wherein
 the transmission line is provided on both the input side and the output side of the integrated circuit, and 
 an input and an output of the integrated circuit and the wider width sides of the two tapered lines of the transmission line are connected by bonding wires. 
 
     
     
       13. The integrated circuit mounted device according to  claim 11 , wherein
 the integrated circuit comprises a plurality of transistors arrayed in parallel with the wider width sides of the two tapered lines of the transmission line. 
 
     
     
       14. A communication device module, comprising:
 an integrated circuit mounted device that includes an integrated circuit and a transmission line, 
 the transmission line comprising:
 two tapered lines having a tapered planar shape and arranged in parallel; 
 an opposite line provided in opposition to the narrower width sides of the two tapered lines; and 
 bonding wires for connecting the narrower width sides of the two tapered lines and the opposite line, wherein 
 the distance between two outer edges on the narrower width sides of the two tapered lines arranged in parallel is greater than the distance between outer edges on the opposite side of the opposite line in opposition to the narrower width sides of the two tapered lines.